USD312421SExpiredUtility

pH meter

59
Assignee: HACH COPriority: Sep 4, 1987Filed: Sep 4, 1987Granted: Nov 27, 1990
Est. expirySep 4, 2007(expired)· nominal 20-yr term from priority
Inventors:Jerry B. Trottmann
59
PatentIndex Score
13
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a pH meter, as shown.

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